Inferior Cerebellar Vermis

Hi,
My wife is in her 20th week of pregnancy. We had the 19th week scan of babies anatomy and were told that the ultrasound shows baby having inferior cerebellar vermis. There were no other abnormalities detected. We are not sure what this means and were not told how this would affect the child. All we have been told that this is not good and we should be considering the termination of pregnancy. Can anyone let know what this is about as we are not sure in what direction to go.
Much appreciated.